Performance of editing/sculpting
Something I've seen is that the taskbar is known to be inaccurate for showing the GPU usage. You could download something like MSI Afterburner which will allow you to see your GPU usage as it is more accurate. In the past, I've had my task manager saying I'm using 14% when I was using 100% so your problem could be that your GPU is running at 100% but task manager isn't showing it.
Link for MSI Afterburner - https://www.msi.com/Landing/afterburner